Typo Update README.md

[0xbryer]

Fix Typo in Documentation

This pull request addresses a small but important typo in the documentation for Rust EVM. The phrase:

"when we successfully tested one integrating Geth to sync the mainnet."

has been corrected to:

"when we successfully tested it by integrating Geth to sync the mainnet."

Importance of the Fix:

This correction is important for clarity and accuracy. The original sentence was slightly confusing due to the use of "one" instead of "it" and the preposition "by" to describe the action of integrating Geth. The corrected version makes the intent clearer, ensuring that users understand the context of the integration and testing process more effectively.

Thank you for considering this improvement!